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518
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 extern int ngx_eventfd;
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13 extern aio_context_t ngx_aio_ctx;
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14
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15
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16 static void ngx_file_aio_event_handler(ngx_event_t *ev);
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17
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18
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19 static long
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20 io_submit(aio_context_t ctx, long n, struct iocb **paiocb)
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21 {
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22 return syscall(SYS_io_submit, ctx, n, paiocb);
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23 }
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24
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25
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26 ssize_t
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27 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset,
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28 ngx_pool_t *pool)
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29 {
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30 long n;
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31 struct iocb *piocb[1];
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32 ngx_event_t *ev;
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33 ngx_event_aio_t *aio;
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34 static ngx_uint_t enosys = 0;
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35
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36 if (enosys) {
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37 return ngx_read_file(file, buf, size, offset);
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38 }
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39
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40 aio = file->aio;
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41
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42 if (aio == NULL) {
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43 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t));
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44 if (aio == NULL) {
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45 return NGX_ERROR;
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46 }
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47
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48 aio->file = file;
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49 aio->fd = file->fd;
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50 aio->event.data = aio;
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51 aio->event.ready = 1;
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52 aio->event.log = file->log;
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53 file->aio = aio;
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54 }
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55
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56 ev = &aio->event;
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57
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58 if (!ev->ready) {
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59 ngx_log_error(NGX_LOG_ALERT, file->log, 0,
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60 "second aio post for \"%V\"", &file->name);
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61 return NGX_AGAIN;
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62 }
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63
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64 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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65 "aio complete:%d @%O:%z %V",
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66 ev->complete, offset, size, &file->name);
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67
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68 if (ev->complete) {
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69 ev->active = 0;
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70 ev->complete = 0;
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71
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72 if (aio->res >= 0) {
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73 ngx_set_errno(0);
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74 return aio->res;
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75 }
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76
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77 ngx_set_errno(-aio->res);
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78 return NGX_ERROR;
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79 }
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80
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81 ngx_memzero(&aio->aiocb, sizeof(struct iocb));
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82
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83 aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev;
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84 aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD;
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85 aio->aiocb.aio_fildes = file->fd;
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86 aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf;
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87 aio->aiocb.aio_nbytes = size;
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88 aio->aiocb.aio_offset = offset;
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89 aio->aiocb.aio_flags = IOCB_FLAG_RESFD;
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90 aio->aiocb.aio_resfd = ngx_eventfd;
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91
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92 ev->handler = ngx_file_aio_event_handler;
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93
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94 piocb[0] = &aio->aiocb;
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95
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96 n = io_submit(ngx_aio_ctx, 1, piocb);
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97
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98 if (n == 1) {
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99 return NGX_AGAIN;
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100 }
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101
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102 n = -n;
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103
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104 if (n == NGX_EAGAIN) {
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105 return ngx_read_file(file, buf, size, offset);
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106 }
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107
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108 ngx_log_error(NGX_LOG_CRIT, file->log, n,
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109 "io_submit(\"%V\") failed", &file->name);
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110
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111 if (n == NGX_ENOSYS) {
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112 enosys = 1;
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113 return ngx_read_file(file, buf, size, offset);
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114 }
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115
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116 return NGX_ERROR;
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117 }
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118
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119
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120 static void
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121 ngx_file_aio_event_handler(ngx_event_t *ev)
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122 {
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123 ngx_event_aio_t *aio;
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124
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125 aio = ev->data;
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126
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127 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0,
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128 "aio event handler fd:%d %V", aio->fd, &aio->file->name);
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129
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130 aio->handler(ev);
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131 }
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